The audio system on STK1000 let you develop multimedia and other systems that have audio capabilities.
STK1000 have to options for creating sound, using internal DAC's of AVR32 devices and using an external DAC with amplifier.
The following block diagram shows the STK1000 audio system.
Refer the help files of the daughter board to find out what interfaces are used and which peripheral on the processor are connected to the interface.